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[media] mx2_emmaprp: remove V4L2_FL_LOCK_ALL_FOPS 

Add proper locking to the file operations, allowing for the removal
of the V4L2_FL_LOCK_ALL_FOPS flag.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Hans Verkuil 2012-06-24 06:29:33 -03:00 committed by Mauro Carvalho Chehab
parent cbc807dc8a
commit 954f5bcb39
1 changed files with 22 additions and 6 deletions
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28
drivers/media/video/mx2_emmaprp.c
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@ -795,11 +795,17 @@ static int emmaprp_open(struct file *file)
file->private_data = ctx;
ctx->dev = pcdev;
if (mutex_lock_interruptible(&pcdev->dev_mutex)) {
kfree(ctx);
return -ERESTARTSYS;
}
ctx->m2m_ctx = v4l2_m2m_ctx_init(pcdev->m2m_dev, ctx, &queue_init);
if (IS_ERR(ctx->m2m_ctx)) {
int ret = PTR_ERR(ctx->m2m_ctx);
mutex_unlock(&pcdev->dev_mutex);
kfree(ctx);
return ret;
}
@ -808,6 +814,7 @@ static int emmaprp_open(struct file *file)
clk_prepare_enable(pcdev->clk_emma_ahb);
ctx->q_data[V4L2_M2M_SRC].fmt = &formats[1];
ctx->q_data[V4L2_M2M_DST].fmt = &formats[0];
mutex_unlock(&pcdev->dev_mutex);
dprintk(pcdev, "Created instance %p, m2m_ctx: %p\n", ctx, ctx->m2m_ctx);
@ -821,9 +828,11 @@ static int emmaprp_release(struct file *file)
dprintk(pcdev, "Releasing instance %p\n", ctx);
mutex_lock(&pcdev->dev_mutex);
clk_disable_unprepare(pcdev->clk_emma_ahb);
clk_disable_unprepare(pcdev->clk_emma_ipg);
v4l2_m2m_ctx_release(ctx->m2m_ctx);
mutex_unlock(&pcdev->dev_mutex);
kfree(ctx);
return 0;
@ -832,16 +841,27 @@ static int emmaprp_release(struct file *file)
static unsigned int emmaprp_poll(struct file *file,
struct poll_table_struct *wait)
{
struct emmaprp_dev *pcdev = video_drvdata(file);
struct emmaprp_ctx *ctx = file->private_data;
unsigned int res;
return v4l2_m2m_poll(file, ctx->m2m_ctx, wait);
mutex_lock(&pcdev->dev_mutex);
res = v4l2_m2m_poll(file, ctx->m2m_ctx, wait);
mutex_unlock(&pcdev->dev_mutex);
return res;
}
static int emmaprp_mmap(struct file *file, struct vm_area_struct *vma)
{
struct emmaprp_dev *pcdev = video_drvdata(file);
struct emmaprp_ctx *ctx = file->private_data;
int ret;
return v4l2_m2m_mmap(file, ctx->m2m_ctx, vma);
if (mutex_lock_interruptible(&pcdev->dev_mutex))
return -ERESTARTSYS;
ret = v4l2_m2m_mmap(file, ctx->m2m_ctx, vma);
mutex_unlock(&pcdev->dev_mutex);
return ret;
}
static const struct v4l2_file_operations emmaprp_fops = {
@ -916,10 +936,6 @@ static int emmaprp_probe(struct platform_device *pdev)
}
*vfd = emmaprp_videodev;
/* Locking in file operations other than ioctl should be done
by the driver, not the V4L2 core.
This driver needs auditing so that this flag can be removed. */
set_bit(V4L2_FL_LOCK_ALL_FOPS, &vfd->flags);
vfd->lock = &pcdev->dev_mutex;
video_set_drvdata(vfd, pcdev);